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As omnivorous birds, ducks will eat many different foods, and the best foods to offer ducks include: 1  Cracked corn. 2  Wheat, barley or similar grains. 3  Oats (uncooked; rolled or quick) 4  Rice (cooked or uncooked) 5  Milo seed. 6  Birdseed (any type or mix) 7  Grapes (cut in half or quartered if very large)
Many ducks also eat gravel, small stones or sand. While these items do not provide any nutritional value for ducks, gravel, stones, and sand actually help ducks digest their food better. The rough texture helps break down the duck's food.ome of the plants that ducks eat are grass, weeds, algae, seeds, grain, berries, fruit and aquatic plants. Some of the animals that ducks eat are snails, mollusks, worms, frogs, salamanders, small fish and fish eggs. Ducks also eat insects. One species of duck called the Merganser, eats mostly fish.